Malicious PDF — malware analysis report

Static analysis result for SHA-256 911c1c048c58c2bf…

MALICIOUS

PDF

45.1 KB Created: 2020-11-05 12:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 58fc9d0bcc16e40660f089886eb2cf6e SHA-1: 0601d32b6583f1620ac2b8c214ec0997a70dcab5 SHA-256: 911c1c048c58c2bff4597852c15e0a3a897b0d7c470ad2ba0e513c68218dc040
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and a known malicious redirector. The primary malicious URL identified is https://ggtraff.ru/123?keyword=annotated+bibliography+examples+chicago+style, which is flagged as a malicious redirector. The document's structure and content suggest it is part of a link farm designed to drive traffic to malicious sites, likely as a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?keyword=annotated+bibliography+examples+chicago+style In PDF document text
    • https://vufizirisabewi.weebly.com/uploads/1/3/4/4/134443644/2f4041e6c25c6.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/0f5da78a5f130b.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/vunud.pdfIn PDF document text
    • https://domuzowejiro.weebly.com/uploads/1/3/4/3/134360268/nifomuxit-vovamezuviwu-tinalapadoku-xukanu.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/luguzimogoni.pdfIn PDF document text
    • https://valetakomo.weebly.com/uploads/1/3/4/0/134012509/7318621.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/xiroruwoso.pdfIn PDF document text
    • https://taferirufip.weebly.com/uploads/1/3/4/5/134582969/803299.pdfIn PDF document text
    • https://kokejegifuro.weebly.com/uploads/1/3/4/4/134477846/3578822.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/leserupasunakomekukakukab.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/farifekumotejotutaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8670/1256/files/fukipurofavabera.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7135 5784 bytes
SHA-256: 7e797d5331d61e3fa7ea240b120726059a118e305504f9f1e789527ac11c9b51
font_01_sfnt_off000084c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C4 10152 bytes
SHA-256: 4e96fabd90965dddf31eb49e9e1806332f85fe9148557ad7ac6750213a56a78a

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